Create calculated pdf form with encryption and validation.

I have created a pdf form in itextsharp without calculated fields. According to my search and development as well as expert advice calculated fields are not possible in itextsharp open source. 

Is It possible to do with aspose.pdf.

My basic requirement listed as,

1. Create pdf form programmatically in asp.net.

2. Provide calculated fields and validation on editable fields.

3. Provide encryption.

4. Feature to read fdf fields.

Calculated fields means i have 3 fields in pdf like Quantity, Rate and amount. quantity come from database at the time of pdf creation on that time Rate and amount column will be blank.

When user enter rate on rate column, amount column will be auto calculated(Quantity * Rate).

Validation: Rate column accept only integer value. 

If it is possible, then HOW?

Thanks